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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f7aa91efdee2f23be4544ab7db8bd83a3f7e96c89129548b82a968be5308af' 
  AND token = 'U01/PgDIWTU3nDphjcgz9ltVnky+e/rFvKc0Mz2v7uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}